Adjustable filter darkroom light



March 13, 1951 A, GOLDEN 2,545,274

ADJUSTABLE FILTER DARKROQM LIGHT Filed June 25, 1947 s Sheets-Sheet 1 INVENTOI L ALTON H. GOLDEN AfTY.

I A. H. GOLDEN ADJUSTABLE FILTER DARKROOM LIGHT '3 Sheets-Sheet 2 March 13, 1951 Filed June 25, 1947 INVENTOR. ALTO/v H. GOLDEN ATTY.

March 13, 1951 v A. H. GOLDEN 2,545,274

ADJUSTABLE FILTER DARKROOM LIGHT Filed June 25, 1947 3 Sheets-Sheet 3 INVENTOR.

T 15. 7 .ALTou 60mm Patented Mar. 13, 1951 UNITED STATES PATENT OFFICE Alton H. Golden, an Cleveland, Ohio Applicaticn June 25, 1947, Serial No. 756,978

3 Claims. (Cl. 240-20) being processed. Certain attempts have been made to produce filters or screen members which have different filter zones provided, which zones can be individually associated with a light generating source by assembly of the apparatus with the predetermined filter means in operative position. However, all of such filter devices having a plurality of difierent filter zones have been somewhat difficult to use in that certain assembly and disassembly of the apparatus was involved with each change of filter zones. As an operator may vary the type of film being processed quite frequently, or the individual filmbeing processed may even require different filter means to be used at various stages of its processing, it obviously is undersiable, or even impossible, to have tovary the filter zone frequently, or during the processing. of the film. I

The general object of the present invention is to avoid and. overcome the foregoing and other difiiculties in and disadvantages of a variable filter light for developing rooms and to provide a new and improved developing room light that has a plurality of filter zones which can readily and easily be associated with the light, as desired. Another object of the invention is to provide a compact developing room light which will retain a given position with any desired filter zone of the apparatus in operative position.

Another object of the invention is to provide a developing room light fixture that can be disassembled readilyto change the bulb therein.

A further and more detailed object of the invention is to provide a transparent tubular member which has aplurality of longitudinally extending filter zones formed therein and to position a shade of cylindrical segmental shape adjustable with relation to the transparentsleeve so that the shade can'be positioned to expose any desired filter zone for action.

The foregoing and other objects and advantages of the invention will be made apparent as the specification proceeds,

' Fig. 4 is a vertical Attention is directed to the accompanying drawings, wherein;

Fig. 1 is an elevation of a light for a developing room embodying the principles of the invention;

Fig. 2 is a right end elevation of the light of Fig. 1;

Fig. 3 is a longitudinal section of the light of I Fig. l; I

section on line i -4 of Fig. 2; I 1

Fig. 5 is a fragmentary perspective view of the joint between the mounting bracket sections;

, Fig. 6 is an end elevation, partly in section, of

a light embodying a modification of the invention; and

c Fig. 7 is a longitudinal section taken on the line 1-1 of Fig. 6.

Referring to the details shown in the drawings, a dark room light indicated generally by the numeral I0 is shown and the light is adapted to be mounted on a wall bracket II which pivptally carries a split, U-s haped bracket l 2 that positions the light fixture of the invention. The bracket [2 is shown as including end sections l3 and I4 that are adapted to bev engaged by relative telescopic movement axially therebetween. The sections [3 and M are engaged by means of ofiset fingers I5 formed on the section 13 and engaged with offset, arch ,or bridge sections l6 formed on the bracket section 14 adapted to receive the fingers l5v snugly therein. The split construction of the bracket l2 permits the .dark room light of the inventionto be disassembled readily so as to change the light bulb positioned therein, as hereinafter explained.

As a feature of. the invention, the light l0 includes a'cylindrical, or sleeve-like, transparent body member 11 which is made, ordinarily, from laminations of a transparent plastic, such as Lucite. The cylindrical member I! has an outer shell I8 and an inner shell l9 between which longitudinally extending filter means such as a sheet 2! is positioned. The sheet 2| is formed from a plurality ofsegments of filter means of different properties so that the individual sec tions of the filter sheet can be used when desired with each different filter extending the complete length of the cylindrical body member [1. The exposure of the various filter means associated with the cylindrical body member I! is controlled by means of a cylindrical shade 22 which is of such length circumferentially of the body member as to cover slightly more'than two-thirds of the circumference thereof, as best shown in Fig.

.5 52. The shade 2 2 is adjustably associated with light 10.. .and thetubelll serves as-a journal for-:the-cylinr and carried by the cylindrical body member I! and to this end a recess 23 is formed in the cylindrical body member ll, adjacent each end thereof. The shade 22 is provided with a circumferentially extending bead 24 on its inner periphery adjacent each end thereof and these beads are adapted to engage with the circumferentially extending continuous recesses 23 formed in the cylindrical body member IV. The shade 22L may have end flanges z fiiformed" there on but the shade" mustbe of sufficient resiliency that one end thereof can be expanded slightly so as to telescope the shade over the cylindrical" body member so as to engage. the: shade: for

operative association with such cylindrical body member l1.

Fig. 4 indicates that three circumferentially extending segments A, B and C are provided with relation to the cylindrical body member FL and these segments indicate. the different filter zones formed. on provided in: the: cylindrical. body member [1. Of course, there can be-anydesined; number of. zones provided inthelighttor. light fixture of.- the. invention. and; this embodiment. of. the. in.- vention provides. for" three of: such filter zones. Preferably a red screen is provided in filter. zone A, an. amberscreen. in zomsB anda green: semen in filter zone C. Fig. 4 best shows that theeopem ing;in.the shade Z2 is of less; eircumferential extent than the filter zone so as to prevent any undesiredllightinaysfmm passing; thmughmr out; of the .shade. Z2

Erefenably the. cylindrical: body. member H, is provided with. opaque: end sections 25. anck 23 which may be made from any suitable-amaterial; suchaswood on'plastic. The end ZSIreceiVes a tube 28 which is secured to the enm sect-ion: IA.- of the-mountingbracketl2. by. means of. a: plurality of-lock nuts,2.9.. 'llhe tubaZBiis-ada ted. to. carry a. socket. 3 l which carries, a... conventional. light hulb.32 which-is. positioned within-the dark room The connection; between the. end- 26 drical bodymember I71 to per-mitirotat-ion. of. the same onitslongitudinalaxis. The. other endl] for. the memben- I1. is removably secured: thereto by means. of screws. 33wbereasthe end;ZE.-is,fi-x;- edly engaged. with the body membenin. any do..- siredl manner... The end. 21; is: engaged with: a trunnion. 34 whichis. journaledin. the end section ii of. the bracket [2. Almob 35.is securectto,the

outer. end of. thetrunnion. in any desiremmanner so.- that. the. knob. 35 can. be used to rot-ate. the

cyli'ndribal. body, member. ll on its. longitudinal axis. In order tmefi'ect the desired change. be;- tween the. shadev 2'2; and. the various. filter. seg- .ment's',, the. operator.- of the light. merely, retains the... shade.v 22. against. rotative movement. when turning the:cylindricaLbody'member Llabouhitslongitudinal axis by. the knob-35:. Qf. courseaar cuat'e. movement of; both. the. body member; and shade as a unit may beparmitted ate-any. timeso as to vary the direction of the light flow-fromlthe light of the invention. Further. adjustment. of such-direction of'li'ght flow fromithe; lightLofTthe invention can; ofcourse; be provided by rotating the cylindrica'f body member: IT and associated means as a; unit" about the Walt bracket lli'si'nce the U =shapedbracket l2*ismivotallysupported to such wall. bracket by means of a grommet; or rive-1H6:

When the light bulb 32* is tobechanged; such action can be readily" eifected by moving the shade Z2- so as to expose the screws: 33" used to retain the end 2 in: engagement with the cylirrdrical body member and, after" removing the screws 33 holding the end to the body member, the entire bracket section I3, trunnion 34, and associated members can be easily withdrawn with relation to the remainder of the apparatus whereby one end of the cylindrical body member I! is exposed.

A modified form of the light of the invention is shown in Figs. 6 and 7 and in this instance the shade member is positioned within rather than Without. the transparent; filter carrying cylinder of the light: These figures show that the cylindrical body member Ill carries a filter sheet |2I between the laminations thereof, and that an arouate shadel2'2-,.extending the length of the body member H1 is carried within the bore of the body member; One end of the shade I22 is suitably secured toan inwardly extending cylindrical flange MU formed" on a metallic end disk I26. One: end; of the cylindrical body member H1 is engaged with and rotatably carried on this flanges IA!) and..the.- other. end of. member I.l.-1- is correspondingIy. mounted on a. flange. UM formed. on asecondend member 12L Thefiange L l'll normally. receives. the opposite. of. the shade I22. therein. and. makesra snug. engagement therewith so as. to. prevent passage: of. light: there;-

between.. Fig. 7-, shewsrthat-tlreeenm I21: may be welded! tea, bracket.- section. [42. whichis, remove ahly" enga ed with az-br-ackeiztall by screws; M3 that im turn. piyotally engages the wall bracket Ir bye alsuitableagrommet- 316; 'I-Ihus;,.as-imthe preferred: embodiment: of; the invention, the dark room light may ber-otated as a. unit in: a plane including: its longitudinal axis and; parallel. to the bracket lil'liz, S-ucln mounting: members; are adapted: to: give: a. variable? mounting position. to thali'glriz enable: itto: any given posittiom In: this modifiedi embodiment oftheihvention; alight 13?; ispositionediwithirr theoylindiical: body member Mil-f by: means: of a socket' l 3- l. that: is associated witha grommet or tube [-28 which: is secured to the bracket; M2; The tube I18 journals the end" I26 on the-bracketl i=2 so that theend r25: associated with the cylindrical borfymember'- l-l-F canbe used by-the operator for turning the-shade F22 arcuatelywith relationv to the body member- M7 by holding the member FIT iirone: position to expose any" desired; filter zone in=the=filter" sheet" I215 To. change, the light bulb [32,.the removable bracket sectiorr ll2 is taken ofi by the removal of the screws- Hi3" and the. end member ["21' canibe teleseoped out of engagement" with. the; cylihdrilcal'bodyfmember II'Tso; to; expose. the interior ofthedark'roomlight':

From the: foregoing; description of the, invene tion; it will. be seen that. aneasily adjustable darkroomlight device is provided which. can be "adaptedforuse with any commercial type; offilm Without" damage to-such film during its develop.- ment or other processing, While; a laminated cylindrical transparent. bodymember. is shown in both embodiments of f the invention, this. member place" of the specific brackets. disclosed, although provision must. always be made for partial dis.- assembly of the apparatus to permit. change of the light bulb shouldjiti burnout or shouldlaidib ferent power bulb be desired; The. light bulb. or

light bulb fixture of the; inventionis. easily comstructed from conventional" materials and is I adapted for a long service life with a minimum of maintenance thereon.

While two embodiments of the invention have been completely illustrated and disclosed herein, modification of such constructions may be made without departing from the scope of the invention as defined in the, appended claims.

Having thus described my invention, what I claim is:

1. A light of the class described comprising a tubular filter member having a plurality of longitudinally extending zones extending the full length of said filter member and having differ ent light filter characteristics, said filter member having a circumferentially extending groove formed in its outer surface, an open end resilient arcuate shade partially encompassing said filter member and extending the length thereof, said shade having a circumferentially extending bead formed on its innerisurface resiliently engaged with the groove in said filter member to permit controlled relative arcuate movement therebetween, an electric light associated with and positioned within said filter member, end members positioned within said filter member, and means engaged with said end members to position said filter member and shade for arcuate movement on their longitudinal axes whereby any desired zone of said filter member can be exposed by relative movement between said filter member and shade.

2. A developing room light comprising a split mounting bracket, a transparent cylindrical member having a circumferentially extending recess formed in its periphery adjacent each end thereof, colored filter means for arcuate circumferentially spaced sections of said cylindrical member, said cylindrical member being journaled on said bracket for rotation about its longitudinal axis, an arcuate shade having an open segment extending longitudinally thereof to expose part of said; cylindrical member, said shade being adapted; to be expanded out and telescoped over said cylindrical member and engag resiliently therewith, opaque end members for said cylindrical member, at least one of said end members being removably secured to said cylindrical member, journal means connecting .said end members to said bracket, said shade being provided with circumferentially extending beads on the inner surface thereof that engage with'the recesses in said cylindrical member to position said shade thereon in fixed association therewith and adapt it for relative arcuate movemer tf with relation thereto, a light positioned inside of said cylindrical member, and means for rotating said cylindrical member on said bracket andj ith relation to said shade to expose any desired portion of said filter means, said shade being carried by said cylindrical member for arcuate movement with relation thereto.

3. ""'A light of the class described comprising an arcuate filter member having a plurality of iongitu'dinally extending arcuate circumferentially spaced uniform size zones of different light filter characteristics, an arcuate shade adjustably positioned on the outer surface of said filter member and of an arcuate length equal to said filter member less one zone thereof, an electric light associated with said filter member within the arc defined thereby, end members for said filter member positioned within same, means engaged with said end members to position." said filter merfiber and shade for arcuate movement on their longitudinal axis whereby any desired zone of said filter member can be exposed, and handle means secured to one of said end members to facilitate rotation of said filter member on its longitudinal axis, said shad being engageable manually and rotatably carried by said filter member to enable the said handle means to set the desired zone of said filter member at the opening in said shade.

ALTON H. GOLDEN.

REFERENCES CITED I The following references are of record in the fileof this patent:

UNITED STATES PATENTS Germany Apr. 16, 1925 

